Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a4e56b1f4e1f23126bc710f85da43c6f32a3a33340cb00b1f72728448514f4' 
  AND token = 'Jpc56NT9+Vz/FsuRCtf6Yk3CiOIFYIHVUStPRyiNPFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}